Bloodworms are the larvae of certain species of midge flies, particularly those in the family Chironomidae. They are typically bright red due to the presence of hemoglobin, which helps them survive in low-oxygen environments like muddy waters. Bloodworms are commonly found in freshwater habitats and are often used as bait for fishing. These larvae play an important role in the ecosystem by serving as a food source for various aquatic animals, including fish and birds. In addition to their ecological significance, bloodworms are also used in aquaculture and as a nutritious food for pet fish and other aquatic pets.